Ernst f



E. F; AUTENRIETH. 111111111 P011 SANDPAPERING MAGHmEs'.

v(No Model.)

110. 456,298. 'Patented .my 21, 1891.

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' UNITED STATES PATENT OFFICE,

ERNST F. AUTENRIETH, OF NEl/V YORK, N.'Y.

DRUM FOR SANDPAPERING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 456,298, dated July 21,1891. Application led March 16, 1891- Serial No.' 385.249. (No model.)

To a/ZZ whom t may concern:

Be it known that I, ERNST F. AUTENRIETH, of the city and county of NewYork, in the State of New York, have invented a new and usefulImprovement in Drums for Sand paperlng-Machines, of which the followingis a specication.

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My invention relates to an improvement in drums forsandpapering-machines, and more particularly to the mechanism forholding the sand-paper on the drum and imparting to it the desiredtension.

A practical embodiment of my invention is represented in theaccompanying drawings, in Whichi Figure l is a view of the drum inlongitudinal section, the operative parts therein being shown in sideelevation. Fig. 2 is a transverse section through the drum on the lineof Fig. l, and Fig. 3 is a transverse section through the drum on theline y y of Fig. l..

The shell of the drum is represented by A, and the several circularframes which stiften and hold it in position and by which it is mountedupon the drum-shaft ct are represented by B, B', and B2. The two formerB and B are located at the ends of the drum and the latter B2intermediate of the ends. It is obvious that the number of intermediateframes might be more than one, as found expedient.

The several frames B B B2 are provided upon one side with correspondingre-entrant portions b, upon the opposite sides of which seats b b2 areprovided for the reception of the guide-cheeks O and C. The cheeks C Care preferably formed of wood, and their outer faces form prolongationsof the exterior curved surface of the cylinder-shell, the edges of whichabut against the opposite sides of the I cheek-pieces, as shown at b3h4. The cheekpieces may be secured to their seats by bolts C, the headsof which are countersunk in the outer faces of the cheeks. The adjacentedges of the cheeks approach near each other at the periphery, and arerounded to 'form smooth bearings c for the sand-paper D, the edges of Ywhich are intended to extend through the opening between the cheeks andthe grasping-jaws. The space between the cheeks C C within the peripheryis widened to receive the swinging tension-roller E and the movablegrasping-jaw F, located below orinside of the tension-roller. Thetension-rollerE is mounted in the ends of vibrating levers G, theoperating-arms g of which are in position to be simultaneously actedupon by cones 7L on a rotary and longitudinally-movable shaft H. Themovable grasping-j aw F is secured to the ends of vibrating levers G',the operatingarms g2 of which are in position to be simultaneously actedupon by cones 1,' on a rotary and lon gitudinally-movable shaft I. Thetwo sets of levers G and G are conveniently mounted upon Aa single rodK, extending through the several frames B B B2.

The lever-operating shafts H and I are respectively provided withscrew-threaded portions h and i', adapted to engage correspondingscrew-threaded openings h2 and 2 i-n the frames B and B, and have theirends h2 and i2 fitted-as, for example, by squaring--tol receive anoperating-wrench. The turningof either shaft will force itlongitudinally, and will thereby force the roller or the graspingjawtoward the edges of the paper or release them therefrom. Opposite themovable jaw F there is located a fixed jaw F', and opposite the roller Ethere is located a concave seat e. The paper is adjusted on the drum bypassing it around the same and placing its edges Abetween the jaws F F.The movable jaw F is then forced toward the jaw F by turning the shaft Iuntil sufficient pressure is obtained to prevent the edges from escapingfrom the jaws and lat the same time allowing one of the edges to slipslightly upon the other under strain. The shaft H is then turned toforce the roller E toward the seat e, and the strain thereon will causethe taking up of any slack and smoothing out any wrinkle which may haveformed in the paper in placing it around the drum slightly out of true.When the paper is drawn perfectly smooth, the jaw F is forced snuglyhome to prevent any slipping of the edges, and the necessary additionaltension may then be applied by a further rocking of the roller E. v A

Vtith a view to balance the drum as far as maybe, l make the shaft lheavy and the shaft l-l light, enlarging the cone portions h IOO thereonto give the roller E the required movement.

VVha-t I claim is- Il. The combination, Wi th the drum-shell and itssupporti11g-frames, of a grasping` de- Vice located Within the peripheryolf the shell and a separate tension device having a movement transverseto the position of the held ends of the abrading material and locatedbctween the grasping device and the periphery of the shell, and meansfor operating the said device, substantially as set forth.

2. The combination, with the drum-shell and its supports, of a movableholder and a rotary and longitudinally-movable shaft provided with acone for operating1 the movable holder, substantially as set iorth.

23. The combination, with the drum-shell and its supports, of a movablegrasping-jaw and a movable tension device, and longitudinally-movableand rota ry shafts provided with cones, one for operatil the jaw andanother zo for operating the tension devices, substantially as setforth.

11. The combination, with the recessed drum, of the tension-rollersecured to swinging levers, the grasping-jaw seen red to other swinging;l levers, and shafts having,` cone portions adapted to-engag'ethe .levers and having a screw thread engagement with the drum, wherebythe rotary movement of the shafts will operate the said levers,substantially as set forth.

5. The co1nbination,with the recessed drum, the tension device, and thegrasping device, of an operating-shaft for the tension device, locatedupon one side of the axis of the drum, and an operating-shaft l'or thegrasping device, located upon the opposite side ot the axis, the shaftshaving diii'erent weights, substantially as set forth.

ERNST l?. AUTENRIE'IH.

XVitnesSes:

FREDK. HAYNEs, GEORGE BARRY.

